The pair adopted toffy accents for the call, during which the nurse refers to Greig as "ma'am", while a third member of 2Day FM staff can be heard pretending to bark in an attempt to impersonate one of the Queen's corgis.

Greig asks the nurse when she can visit her "granddaughter Kate" and how her "little tummy bug is going".

John Lofthouse, chief executive at King Edward VII's Hospital, said: "This was a foolish prank call that we all deplore. We take patient confidentiality extremely seriously and we are now reviewing our telephone protocols."

The Australian Communications and Media Authority said it had received complaints about the prank on Wednesday night.

ACMA has not launched an investigation into the call.

Under its live hosted entertainment code of practice, for shows which have a live host and competitions, stunts or pranks, the content must not be exploitative.

ACMA defines exploitative as: "Clearly appearing to purposefully debase or abuse the participant for the enjoyment of others, and lacking moral, artistic or other values."

The prank has made headlines around the world.

London's Daily Telegraph reported the prank will reopen debate on the Leveson report, and also questioned whether the pair had broken Australia's broadcasting rules.